Sea to Summit · Updated June 2026
Sea to Summit Spark SpII Ultralight Down Sleeping Bag: price & specs
Sea to Summit Spark SpII Ultralight Down Sleeping Bag. Every price and spec below is linked to its source and dated — no guesses.
Source: advnture.com verified STALE · 2026-06-20 ✓ corroborated verify in ledger
The Sea to Summit Spark SpII Ultralight Down Sleeping Bag is listed at $409 on advnture.com as of 2026-06-27, #15 cheapest of 17 sleeping bags (median $200); other retailers may be lower. It earns a Bronze Deskmark — 48/100 pay-blind standing, #11 of 13 in class.
Verified Jun 27, 2026 · figures linked to their source in the table below
Cheapest sleeping bags: Coleman Brazos 20F Sleeping Bag — $59
Is the Sea to Summit Spark SpII Ultralight Down Sleeping Bag a good buy?
At $409, the Sea to Summit Spark SpII Ultralight Down Sleeping Bag is #14 cheapest of the 17 sleeping bags we track, where the median is $249.95. On the spec sheet, its packed weight of 1.17 lb is the lowest of the 13, its temperature rating f of 28 is above the median of the 19, and its fill power of 850 is at the median of the 11.
Specifications
| Price (US) | $409 MSRP per advnture.com review citing Sea to Summit US pricing |
|---|---|
| Brand | Sea to Summit |
| Released | — |
| Temperature rating f | 28 |
| Insulation type | down |
| Fill power | 850 |
| Shape | mummy |
| Packed weight (lb) | 1.17 |
| Packed size | 2.5 L (approx. 1-liter bottle size) |
| Zipper side | — |
| Product note | Lower limit 28F / -2C; comfort 38F / 4C; Ultra-Dry Down PFAS-free treatment; regular size; 530 g / 18.7 oz |
Source: advnture.com (read 2026-06-20) STALE · 2026-06-20 · corroborated by backcountry.com (read 2026-06-20). Verified: lower limit 28F / comfort 38F, 850+ FP Ultra-Dry Down, regular weight 530 g (18.7 oz / 1.17 lb), packed ~2.5 L, price $409 confirmed via Advnture review and corroborated by Backcountry. Zipper side not determinable; left null. Corroboration URL updated to Backcountry. The corroborating page this record cited (https://www.backcountry.com/sea-to-summit-spark-spii-sleeping-bag-35-degree-down) is gone: on 2026-09-11 it answered 200 and redirected to https://static.backcountry.com/eu/bc_eu.html, both from a residential connection and from a datacenter on another continent — so the page is gone rather than withheld from one asker. This record therefore no longer claims an independent second witness for its figures. The page the figures were read from, advnture.com, still answers.
Is the Sea to Summit Spark SpII Ultralight Down Sleeping Bag worth it vs cheaper sleeping bags?
Sea to Summit Spark SpII Ultralight Down Sleeping Bag against its closest cheaper and pricier sleeping bags on the specs that matter — every value sourced. See all 17 ranked
| Product | Price | Temperature rating f | Insulation type | Fill power | Shape | Packed weight (lb) |
|---|---|---|---|---|---|---|
| Sea to Summit Spark SpII Ultralight Down Sleeping Bag this | $409 | 28 | down | 850 | mummy | 1.17 |
| Therm-a-Rest Parsec 20 Sleeping Bag | $408.42 | 20 | down | 900 | mummy | — |
| Feathered Friends Swallow UL 20 Sleeping Bag | $659 | 20 | down | 950 | mummy | — |
Frequently asked questions
How much does the Sea to Summit Spark SpII Ultralight Down Sleeping Bag cost?
The Sea to Summit Spark SpII Ultralight Down Sleeping Bag has a US price of $409 (MSRP per advnture.com review citing Sea to Summit US pricing), as of 2026-06-20.
How does the Sea to Summit Spark SpII Ultralight Down Sleeping Bag compare on price?
At $409, the Sea to Summit Spark SpII Ultralight Down Sleeping Bag is #14 cheapest of the 17 sleeping bags we track, where the median is $249.95.
What are the Sea to Summit Spark SpII Ultralight Down Sleeping Bag's key specs?
Sea to Summit Spark SpII Ultralight Down Sleeping Bag (Sea to Summit): temperature rating f 28, insulation type down, fill power 850, shape mummy, packed weight lb 1.17. Full sourced spec sheet verified 2026-06-20.
Price of record: $409 at advnture.com, 2026-06-27. Other retailers may be lower — check the current price:
See Sea to Summit Spark SpII Ultralight Down Sleeping Bag on Amazon As an Amazon Associate we earn from qualifying purchases.Similar sleeping bags
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